Retarded electromagnetic switch



' A. M. H-ASL'EV. RETARDED ELECTROMAGNETIC SWITCH.

' APPLICATION FILED MAY-27, I919.

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Patented July 11; 1922.

UNITED STATES PATENT OFFICE.

ANDREAS MARIUS HASLEV, 0F RANDERS, DENMARK.

RETARDED ELECTROMAGNETIC SWITCH.

Application filed. May 27,

T 0 all whom it may concern Be it known that ANDRnAs MARIUS HAs- LEV, electrician, residing at No. 5 Storegade, in the city of Randers, in the Kingdom of Denmark, has invented certain new and seful Improvements in Retarded Electromagnetic Switches, of which the following is a specification.

The present invention relates to a staircase automaton by which the lighting or the lamps is effected by an iron case being attracted by a spool and, thereby, closes the lamp circuit, while the lamps are extinguished by the iron case returning nto the position of repose. The inventionns based on the phenomenon that a magnetized iron body will not lose its magnetism until some time after the magnetizing power has ceased to act.

On the drawing is shown in diagrammatic view one manner of constructing the invention.

An iron core 1 of suitable shape is magnetized and attracted by a spool 2, which is passed by a current, when one of the pushbuttons 3 is depressed. When the iron core is pulled down into the spool 2, contact will be closed between two contact-pieces i and 5, whereby the circuit for the lamps 7 becomes closed. The lamp current passes through a coil 10 containing far less windings than the coil 2. A permanent magnet 8, movably disposed so that it may be approached more or less to the iron core 1, serves to regulate the burning period. The spark produced, between the contact-pieces 5 and 6, by the coil 2 being cut out, will be extinguished by the condenser 9.

The apparatus acts in the following manner:

When one of the push-buttons 3 is depressed, the current will be closed by way of the contacts 5 and 6. Thereby the iron core 1 is attracted and, by its motion, two things will happen. In the first place, the current in the coil 2 is broken at the contacts 5 and 6, the breaking spark generated being extinguished by the condenser 9 and, in the second place, contact is closed between the Specification of Letters Patent.

Patented July 11, 1922. 1919. Serial No. 300,194.

contact-pieces 4i and 5, whereby the lamps 7 are lighted. The iron core 1 is now magnetized by the coil 2, it retaining some magnetism, even after the current in the coil has been interrupted. It will therefore be maintained in the working position by the permanentmagnet 8. The iron core will gradually lose its magnetism and then, it cannot be retained by the permanent magnet but will return to the position of repose, it being pulled back by a counterweight 11 or in any other suitable manner. By adjust ment of the permanent magnet a greater or less distance from the spool and the iron core, the force retaining the iron core may be regulated and, consequently also the time consumed before the magnetism is decreased so much that the core returns to the position of repose, in other words the burning period may be regulated in this manner. Further regulation of the burning period may be effected by the provision of one or more coils 10 also encircling the iron core and being traversed by the lamp current. Its action on the iron core must of course be slight and, for that reason, it contains only a few windings. If this coil is connected in such a manner that it counteracts the spool 2, the burning period will be shortened, and if it is connected in such a manner, that it acts in the same direction as the spool 2 the burning period will be lengthened.

What I claim is:

In a device of the class described, an operating circuit comprising a relay coil and a stationary contact, a lighting circuit comprising a relay coil and a stationary contact, said coils being mounted in alinement and a core movable therein, a counterbalanced lever connected to said core and adapted to engage either contact and close the circuit thcrethrough, and an adjustable permanent magnet mounted below and in alinement with said core and adapted to hold said core in one position under predetermined conditions.

In testimony whereof he aflixes his signature.

ANDREAS MARIUS HASLEV. 

